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Proceedings Paper

Color adjustable LED driver design based on PWM
Author(s): Yiying Du; Caideng Yu; Longcheng Que; Yun Zhou; Jian Lv
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Paper Abstract

Light-emitting diode (LED) is a liquid cold source light source that rapidly develops in recent years. The merits of high brightness efficiency, long duration, high credibility and no pollution make it satisfy our demands for consumption and natural life, and gradually replace the traditional lamp-house-incandescent light and fluorescent light. However, because of the high cost and unstable drive circuit, the application range is restricted. To popularize the applications of the LED, we focus on improving the LED driver circuit to change this phenomenon. Basing on the traditional LED drive circuit, we adopt pre-setup constant current model and introduce pulse width modulation (PWM) control method to realize adjustable 256 level-grays display. In this paper, basing on human visual characteristics and the traditional PWM control method, we propose a new PWM control timing clock to alter the duty cycle of PWM signal to realize the simple gamma correction. Consequently, the brightness can accord with our visual characteristics.

Paper Details

Date Published: 15 October 2012
PDF: 6 pages
Proc. SPIE 8419, 6th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optoelectronic Materials and Devices for Sensing, Imaging, and Solar Energy, 841928 (15 October 2012); doi: 10.1117/12.971205
Show Author Affiliations
Yiying Du, Univ. of Electronic Science and Technology of China (China)
Caideng Yu, Univ. of Electronic Science and Technology of China (China)
Longcheng Que, Univ. of Electronic Science and Technology of China (China)
Yun Zhou, Univ. of Electronic Science and Technology of China (China)
Jian Lv, Univ. of Electronic Science and Technology of China (China)


Published in SPIE Proceedings Vol. 8419:
6th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optoelectronic Materials and Devices for Sensing, Imaging, and Solar Energy
Yadong Jiang; Junsheng Yu; Zhifeng Wang, Editor(s)

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